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Abstract #3507

Reducing EPI Distortion with Gradient Slew Rate of 700 T/m/s in Human Brain Imaging

Ek T Tan 1 , Seung-Kyun Lee 1 , Dominic Graziani 1 , Matt A Bernstein 2 , John Huston 2 , Yunhong Shu 2 , Paul T Weavers 2 , Shengzhen Tao 3 , Joshua D Trzasko 3 , Jean-Baptiste Mathieu 4 , Christopher J Hardy 1 , John F Schenck 1 , and Thomas KF Foo 1

1 GE Global Research, Niskayuna, NY, United States, 2 Radiology, Mayo Clinic, Rochester, MN, United States, 3 Biomedical Engineering, Mayo Clinic, Rochester, MN, United States, 4 GE Healthcare, Florence, SC, United States

A second iteration of a dedicated head-only gradient coil has been completed, allowing a slew rate of 700 T/m/s. Prior to imaging tests and in-vivo validation, we performed simulations to understand the extent of improvements to EPI at slew rates ranging from 200 T/m/s (attainable in many whole-body MRI scanners) to 700 T/m/s. We observe that the higher gradient slew rate will provide a greater than two-fold reduction in echo spacing, and also result in significant reduction in pixel distortion and increase in signal in the temporal lobes of the brain.

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